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Oracle 1Z0-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

Question 1

How are NULL values treated in relational databases?

A. NULL values represent missing or unknown data.
B. NULL values are treated as empty strings.
C. NULL values are treated as zero.
D. NULL values are not allowed in relational databases.

Question 2

What will the following query result in?
SELECT e.employee_id, e.manager_id
FROM employees e
WHERE e.manager_id IS NOT NULL;

A. Employees who do not have managers
B. All employees and their IDs
C. Employees and their managers' IDs
D. Employees who have managers

Question 3

What does the UNION ALL operation do when selecting matching columns from different tables?
SELECT employee_id, salary FROM employees
UNION ALL
SELECT employee_id, bonus FROM bonuses;

A. Returns only the employees with salaries and bonuses
B. Combines the salaries and bonuses for employees, removing duplicates
C. Returns only employees with duplicate employee IDs in both tables
D. Combines all employee IDs, salaries, and bonuses, including duplicates

Question 4

Which INTERVAL data type would you use to store a period of time in years and months?

A. INTERVAL YEAR TO MONTH
B. INTERVAL DAY TO SECOND
C. INTERVAL MONTH TO DAY
D. INTERVAL MINUTE TO HOUR

Question 5

What is the output of the following query?
SELECT CURRENT_DATE FROM dual;

A. The current date and time in the database time zone
B. The current date in the session time zone
C. The current date and time in UTC
D. The current date in the database time zone

Solutions: